Accuracy assessment of FDTD method for the analysis of sub-wavelength photonic structures

Yasuo Ohtera

Research output: Contribution to journalArticlepeer-review


FDTD (Finite-Difference Time-Domain) method has been widely used for the analysis of photonic devices consisting of subwavelength structures. In recent years, increasing efforts have been made to implement the FDTD on GPGPUs (General-Purpose Graphic Processing Units), to shorten simulation time. On the other hand, it is widely recognized that most of the middle-and low-end GPGPUs have difference of computational performance, between single-precision and doubleprecision type arithmetics. Therefore the type selection of single/double precision for electromagnetic field variables in FDTD becomes a key issue from the viewpoint of the total simulation performance. In this study we investigated the difference of results between the use of single-precision and double-precision. As a most fundamental sub-wavelength photonic structure, we focused on an alternating multilayer (one dimensional periodic structure). Obtained results indicate that significant difference appears for the amplitudes of higher order spatial harmonic waves.

Original languageEnglish
Pages (from-to)780-787
Number of pages8
JournalIEICE Transactions on Electronics
Issue number7
Publication statusPublished - 2016 Jul


  • Computational accuracy
  • FDTD method
  • Subwavelength periodic structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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